If no conditions are true, it returns the value in the ELSE clause. Functional requirements can be traced back to a labelled use-case. Below is a sample use case diagram which I have prepared for reference purpose for a sample project (much like Facebook). For example, you can create a custom template to output a table of actors' details, and then a list of use cases, and then a list of sub-diagrams. You will learn how to do this in other articles. Revision 2. The first step in defining a use case is to define the name, using the verb-noun naming convention. It would help us to understand the role of various actors in our project. Runtime environment for advanced analytics, memory for raw or detailed data, and data preparation and integration are top 3 use cases for Hadoop. This quick use case definition allows for agile development of use cases. Use case ID: A unique identifier used for tracing. Select the use case diagram Broadcasting System from the Diagram Navigator. Use Case #1 (From a student group project on Car Rental Application) Use Case Name: Release a Vehicle (to a Customer) Summary: Introduction This is an example of what a structured use case report might look like. Various actors in the below use case diagram are: User and System. Sample Use Case Example. The Use Case Document ties the business needs of a system to the design and implementation of the system. Use cases in a use case diagram can be organized and arranged according to their relevance, level of abstraction and impacts to users.  While 39% of organizations use Hadoop as a data lake, the popularity of this use case will fall by 2% over the coming three years. The SQL CASE Statement. Use Case Name: Place Order.  Customer intelligence leads the list of Hadoop projects. Below are 2 sample use cases for your reference. Use Case Report: Withdraw Cash . Use Case Diagram. Whilst each of these is unique per report, the basic use case is identical, and writing a use case per report (eg Generate Quarterly Sales Report), for a system that may have 100’s, seems wasteful. The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement). The next step is to define the use case at a low level of detail. So, once a condition is true, it will stop reading and return the result. Use-Case ID − Give each use-case a unique numeric identifier, in hierarchical form: X.Y. Related use-cases can be grouped in the hierarchy.  A description for the example would be “This use case description outlines the steps for a student manager to review a student request and approve or deny the request.” Created by: The author of the use case. They show the amount of details that you need to provide for your Requirements Model, i.e., Phase I of the project. Version 1.0 . This example shows the Withdraw Cash Use Case Report, after the first version (UC 3-1) has been structured to omit details that are now found in • UC4-2 Identify Customer Use Case Report • This is also known as a use case brief. For example, if you were writing a use case implementing software to create purchase orders, topics that would be In would include producing reports about requests, merging requests to a purchase order, monitoring deliveries, and new and existing system software. Use-Case Name − State a concise, results-oriented name for the use-case. Just about every project manager has the need to develop a Use Case Document, this template is provided as a starting point from which to develop your project specific Use Case Document. Use case diagram provides a graphical overview of goals (modeled by use cases) users (represented by actors) want to achieve by using the system. Description: A brief textual description of what the use case does.